**Bi"na*ry** (?), a. [L. *binarius*, fr. *bini* two by two, two at a time, fr. root of *bis* twice; akin to E. *two*: cf. F. *binaire*.]

Compounded or consisting of two things or parts; characterized by two (things).

Binary arithmetic, that in which numbers are expressed according to the binary scale, or in which two figures only, 0 and 1, are used, in lieu of ten; the cipher multiplying everything by two, as in common arithmetic by ten. Thus, 1 is one; 10 is two; 11 is three; 100 is four, etc. *Davies** & **Peck**. -- Binary compound Chem., a compound of two elements, or of an element and a compound performing the function of an element, or of two compounds performing the function of elements. -- Binary logarithms, a system of logarithms devised by Euler for facilitating musical calculations, in which 1 is logarithm of 2, instead of 10, as in the common logarithms, and the modulus 1.442695 instead of .43429448. -- Binary measure Mus., measure divisible by two or four; common time. -- Binary nomenclature Nat. Hist., nomenclature in which the names designate both genus and species. -- Binary scale Arith., a uniform scale of notation whose ratio is two. -- Binary star Astron., a double star whose members have a revolution round their common center of gravity. -- Binary theory Chem., the theory that all chemical compounds consist of two constituents of opposite and unlike qualities.
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*© Webster 1913.
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***Bi"na*ry**, n.

That which is constituted of two figures, things, or parts; two; duality.

*Fotherby.*

*© Webster 1913.*